What fumes are produced during the quenching process?

According to the description in "Technical Requirements for Environmental Protection of Heat Treatment GB/T 30822-2014", the main exhaust gas pollutants produced in the quenching process are oil fume due to the use of quenching oil and tempering oil. According to the instructions in "Limits of Hazardous Substances in the Air of Workplaces in Heat Treatment GB/T 27946-2011", the waste gas pollutants generated in the process of low-temperature salt baths such as graded quenching and tempering, and aluminum alloy solid solution aging salt baths are carbon dioxide. , hydrogen chloride and hydrochloric acid, hydrogen, potassium hydroxide, sodium hydroxide, carbon dioxide, sulfur dioxide, hydrogen cyanide and cyanide. The atmosphere of carburizing and hydrocarburizing and tempering and quenching oil will produce oil mist, nitrogen dioxide, carbon monoxide, carbon dioxide, and carbon black dust.

What are the emission standards for the concentration of flue gas produced by the quenching process?

According to the description in "Technical Requirements for Environmental Protection of Heat Treatment GB/T 30822-2014", the emission limit of air pollutants of enterprises should comply with GB 16297 "Comprehensive Emission Standard of Air Pollutants GB 16297-1996" and GB/T 27946 according to " Limits of Hazardous Substances in the Air of Heat Treatment Workplaces. The oil fume produced in the production process should be installed with a fume trap or a fume cleaner in the workshop to purify or recycle the oily gas before discharging it. The fugitive emission of exhaust gas should be strictly controlled, and the unavoidable fugitive emission of exhaust gas should be strictly controlled. The concentration limit of harmful substances in the atmosphere around the emission source of the device should comply with the provisions of GB 16297 and GB/T 27946 and related laws and regulations. When the implementation of this standard cannot meet the local environmental requirements, the local environmental standards shall prevail.

Among them, the "Comprehensive Emission Standard of Air Pollutants GB 16297-1996" stipulates the emission concentrations of benzene, toluene, xylene, and non-methane total hydrocarbons, and the "Limits of Hazardous Substances in the Air of Heat Treatment Workplaces" Occupational exposure limits for oil mist, dust and other hazardous gaseous pollutants are specified.

How to deal with the flue gas in the quenching process?

As can be seen from the above, oil fume, oil mist, dust and other harmful gas pollutants generated during the quenching process need to be controlled. Generally, according to the on-site working conditions, the oil fume is collected by side suction or top suction. In workshops with multiple quenching furnaces and tempering furnaces, the collected oil fume will be cooled and fireproofed first, and then entered into the factory workshop for exclusive use. The oil fume purifier is used for treatment, and the treated oil fume can be discharged up to the standard.